BDS-3新频点单点定位研究

针对目前有关北斗卫星导航系统（BDS-3）中MEO卫星（BDS-3M）增加的B1C、B2a新频点单点定位研究较少的现状，本文开展了基于新频点B1C、B2a的双频单点定位试验，结合国际GNSS监测评估系统（iGMAS）5个跟踪站连续10 d的数据，对BDS-3的新频点进行数据质量分析、双频伪距单点定位（SPP）和双频静态精密单点定位（PPP）研究，并与GPS的L1、L2频点和BDS-3的B1I、B3I频点进行对比。试验结果表明：在伪距单点定位方面，BDS-3新信号在E、N、U 3方向的精度分别优于10、12、11 m，低于GPS的L1、L2双频伪距单点定位和BDS-3的旧频点双频伪距单点定位精度；在精密单点定位方面，BDS-3新频点在收敛速度方面略低于GPS的收敛速度，BDS-3新信号在E、N、U 3方向都能达到分米级精度。

Research on single point positioning of BDS-3 new signal

For the current research on the single point positioning of the new B1C and B2a signals of the MEO satellite( BDS-3M) in the Bei Dou Satellite Navigation System( BDS-3),this paper conducts a dual-frequency single point positioning experiment based on the new signals of B1C and B2a. Combined with data from five tracking stations of i GMAS for 10 consecutive days,data quality analysis,the dual-frequency single point positioning( SPP) and dual-frequency precise point positioning( PPP) are researched,and compared with GPS L1,L2 signals and BDS-3B1I,B3I signals.The experimental results show that the accuracy of the new BDS-3 signal in the directions of E,N and U is better than that of 10,12 and 11 m respectively,and there is some difference between the accuracy of the dual-frequency pseudo-range single point positioning of L1 and L2 GPS and the dual-frequency pseudo-range single point positioning of the old BDS-3. In terms of precise singlepoint positioning,the convergence speed of BDS-3 new frequency point is slightly lower than that of GPS,and the new signal of BDS-3 can reach the accuracy of dm level in the three directions of E,N and U.